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In a subway station, there are exactly enough customers on the platform to fill three trains. The arrival time of the nth train is X1 + ··· + Xn where X1, X2,... are iid exponential random variables with E[Xi] = 2 minutes. Let W equal the time required to serve the waiting customers. Find P[W > 20].
The company economist provides you with the following information concerning probabilities of daily sales events, where events are measured in gallons of wax sold.
The number of shark attacks and deaths over a recent 5- year period is shown. Find the mean, median, mode, midrange, variance, and standard deviation for the date. Which data set is more valuable?
Compute a value V that enables us to state, with 90 percent confidence, that population variance (sigma^2) is less than V.
expectation of the statistic that was proposed by Statistician - Based on the information collected in Tasks 1-8, which of the two statistics produces values which tends to be more concentrated about the expectation of the measurement?
historical data indicates that the standard deviation of a process is 6.3. a recent sample of size 28 produced a sample
Household expenditure for long distance telephone service in City A and average monthly expenditure in City B extends from X to Y, determine the value of X?
There are k types of distinct postcards. How many ways are there to send these postcards to n friends? (Each friend can get zero cards, also multiple copies of the same card.)
Describe the trend in calorie intake over the 30 years. What would you predict the calorie intake was in 2005? Justify your answer by explaining any assumptions you are making about calorie intake.
What proportion of the adult men in United States are more than feet tall? (Hint: feet inches.) Round your answer to at least four decimal places.
Why is the median price used to reflect average home prices in most areas, rather than the mean or mode? Should all people have similar houses or is it fair that some houses are much more expensive than others? Why or why not
A die has half of the faces red and the other half black. The die is rolled 3 times. Let the random variable X represent the number of black outcomes out of three rolls. What is P(1) that is the probability if exactly one black outcome out of three r..
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